/Engine/Source/Runtime/Slate/Public/Widgets/Views/SListView.h
Establishes a wholly new list of items being observed by the list. Wipes all existing state and requests and will fully rebuild on the next tick. The ObservableArray will notify the Widget when it needs to refresh.
void SetItemsSource ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)<::[UE::Slate::Containers::TObservableArray](API\Runtime\SlateCore\Containers\TObservableArray)< ItemType >> InListItemsSource )